Mailing List Archive

# HG changeset patch
# User kaf24@firebug.cl.cam.ac.uk
# Node ID 456b91c81427d58e03d381afbe3dc8ad3a833854
# Parent c05d5e85ded272dd1c988b06b40b1351e9043bc1
The NAT scripts currently work, but the changes below decrease user
error and allow the netmask to be passed in.

Signed-off-by: Jon Mason <jdmason@us.ibm.com>

diff -r c05d5e85ded2 -r 456b91c81427 tools/examples/vif-nat
--- a/tools/examples/vif-nat Wed Oct 12 08:27:28 2005
+++ b/tools/examples/vif-nat Wed Oct 12 08:28:12 2005
@@ -23,7 +23,6 @@
# Exit if anything goes wrong
set -e
export PATH=/sbin:/bin:/usr/bin:/usr/sbin:$PATH
-echo "*vif-nat $*" >&2

# Operation name.
OP=$1
@@ -35,17 +34,25 @@
# Required parameters. Fail if not set.
domain=${domain:?}
vif=${vif:?}
-ip=${ip:?}
+ip=${ip:-'169.254.1.1/24'} #if not defined, give a default address

-# strip /netmask
+echo "*vif-nat $OP domain=$domain vif=$vif ip=$ip" >&2
+
+#determine ip address and netmask
vif_ip=`echo ${ip} | awk -F/ '{print $1}'`
+bits=`echo ${ip} | awk -F/ '{print $2}'`
+intmask=$(( ((0xFFFFFFFF << ((32 - $bits)))) & 0xFFFFFFFF ))
+netmask=$(( (($intmask & 0xFF000000)) >> 24 ))
+netmask=$netmask.$(( (($intmask & 0x00FF0000)) >> 16 ))
+netmask=$netmask.$(( (($intmask & 0x0000FF00)) >> 8 ))
+netmask=$netmask.$(( $intmask & 0x000000FF ))

main_ip=`ifconfig eth0 | grep "inet addr:" | sed -e 's/.*inet addr:\(\w\w*\.\w\w*\.\w\w*\.\w\w*\).*/\1/'`

# Are we going up or down?
case $OP in
up)
- ifconfig ${vif} ${vif_ip} netmask 255.255.255.0 up
+ ifconfig ${vif} ${vif_ip} netmask ${netmask} up
echo 1 >/proc/sys/net/ipv4/conf/${vif}/proxy_arp
iptcmd='-A'
ipcmd='a'

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